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34#include <linux/dmi.h>
35#include <linux/err.h>
36#include <linux/init.h>
37#include <linux/io.h>
38#include <linux/kernel.h>
39#include <linux/leds.h>
40#include <linux/module.h>
41#include <linux/platform_device.h>
42
43#define APU1_FCH_ACPI_MMIO_BASE 0xFED80000
44#define APU1_FCH_GPIO_BASE (APU1_FCH_ACPI_MMIO_BASE + 0x01BD)
45#define APU1_LEDON 0x08
46#define APU1_LEDOFF 0xC8
47#define APU1_NUM_GPIO 3
48#define APU1_IOSIZE sizeof(u8)
49
50#define APU2_FCH_ACPI_MMIO_BASE 0xFED80000
51#define APU2_FCH_GPIO_BASE (APU2_FCH_ACPI_MMIO_BASE + 0x1500)
52#define APU2_GPIO_BIT_WRITE 22
53#define APU2_APU2_NUM_GPIO 4
54#define APU2_IOSIZE sizeof(u32)
55
56
57struct apu_param {
58 void __iomem *addr;
59};
60
61
62struct apu_led_priv {
63 struct led_classdev cdev;
64 struct apu_param param;
65};
66#define cdev_to_priv(c) container_of(c, struct apu_led_priv, cdev)
67
68
69struct apu_led_profile {
70 const char *name;
71 enum led_brightness brightness;
72 unsigned long offset;
73};
74
75
76enum apu_led_platform_types {
77 APU1_LED_PLATFORM,
78 APU2_LED_PLATFORM,
79};
80
81struct apu_led_pdata {
82 struct platform_device *pdev;
83 struct apu_led_priv *pled;
84 const struct apu_led_profile *profile;
85 enum apu_led_platform_types platform;
86 int num_led_instances;
87 int iosize;
88 spinlock_t lock;
89};
90
91static struct apu_led_pdata *apu_led;
92
93static const struct apu_led_profile apu1_led_profile[] = {
94 { "apu:green:1", LED_ON, APU1_FCH_GPIO_BASE + 0 * APU1_IOSIZE },
95 { "apu:green:2", LED_OFF, APU1_FCH_GPIO_BASE + 1 * APU1_IOSIZE },
96 { "apu:green:3", LED_OFF, APU1_FCH_GPIO_BASE + 2 * APU1_IOSIZE },
97};
98
99static const struct apu_led_profile apu2_led_profile[] = {
100 { "apu2:green:1", LED_ON, APU2_FCH_GPIO_BASE + 68 * APU2_IOSIZE },
101 { "apu2:green:2", LED_OFF, APU2_FCH_GPIO_BASE + 69 * APU2_IOSIZE },
102 { "apu2:green:3", LED_OFF, APU2_FCH_GPIO_BASE + 70 * APU2_IOSIZE },
103};
104
105static const struct dmi_system_id apu_led_dmi_table[] __initconst = {
106 {
107 .ident = "apu",
108 .matches = {
109 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
110 DMI_MATCH(DMI_PRODUCT_NAME, "APU")
111 }
112 },
113
114 {
115 .ident = "apu2",
116 .matches = {
117 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
118 DMI_MATCH(DMI_BOARD_NAME, "APU2")
119 }
120 },
121
122 {
123 .ident = "apu2",
124 .matches = {
125 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
126 DMI_MATCH(DMI_BOARD_NAME, "apu2")
127 }
128 },
129
130 {
131 .ident = "apu2",
132 .matches = {
133 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
134 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
135 }
136 },
137 {}
138};
139MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table);
140
141static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value)
142{
143 struct apu_led_priv *pled = cdev_to_priv(led);
144
145 spin_lock(&apu_led->lock);
146 iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr);
147 spin_unlock(&apu_led->lock);
148}
149
150static void apu2_led_brightness_set(struct led_classdev *led, enum led_brightness value)
151{
152 struct apu_led_priv *pled = cdev_to_priv(led);
153 u32 value_new;
154
155 spin_lock(&apu_led->lock);
156
157 value_new = ioread32(pled->param.addr);
158
159 if (value)
160 value_new &= ~BIT(APU2_GPIO_BIT_WRITE);
161 else
162 value_new |= BIT(APU2_GPIO_BIT_WRITE);
163
164 iowrite32(value_new, pled->param.addr);
165
166 spin_unlock(&apu_led->lock);
167}
168
169static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld)
170{
171 int i;
172 int err;
173
174 apu_led->pled = devm_kzalloc(dev,
175 sizeof(struct apu_led_priv) * apu_led->num_led_instances,
176 GFP_KERNEL);
177
178 if (!apu_led->pled)
179 return -ENOMEM;
180
181 for (i = 0; i < apu_led->num_led_instances; i++) {
182 struct apu_led_priv *pled = &apu_led->pled[i];
183 struct led_classdev *led_cdev = &pled->cdev;
184
185 led_cdev->name = apu_led->profile[i].name;
186 led_cdev->brightness = apu_led->profile[i].brightness;
187 led_cdev->max_brightness = 1;
188 led_cdev->flags = LED_CORE_SUSPENDRESUME;
189 if (apu_led->platform == APU1_LED_PLATFORM)
190 led_cdev->brightness_set = apu1_led_brightness_set;
191 else if (apu_led->platform == APU2_LED_PLATFORM)
192 led_cdev->brightness_set = apu2_led_brightness_set;
193
194 pled->param.addr = devm_ioremap(dev,
195 apu_led->profile[i].offset, apu_led->iosize);
196 if (!pled->param.addr) {
197 err = -ENOMEM;
198 goto error;
199 }
200
201 err = led_classdev_register(dev, led_cdev);
202 if (err)
203 goto error;
204
205 led_cdev->brightness_set(led_cdev, apu_led->profile[i].brightness);
206 }
207
208 return 0;
209
210error:
211 while (i-- > 0)
212 led_classdev_unregister(&apu_led->pled[i].cdev);
213
214 return err;
215}
216
217static int __init apu_led_probe(struct platform_device *pdev)
218{
219 apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL);
220
221 if (!apu_led)
222 return -ENOMEM;
223
224 apu_led->pdev = pdev;
225
226 if (dmi_match(DMI_PRODUCT_NAME, "APU")) {
227 apu_led->profile = apu1_led_profile;
228 apu_led->platform = APU1_LED_PLATFORM;
229 apu_led->num_led_instances = ARRAY_SIZE(apu1_led_profile);
230 apu_led->iosize = APU1_IOSIZE;
231 } else if (dmi_match(DMI_BOARD_NAME, "APU2") ||
232 dmi_match(DMI_BOARD_NAME, "apu2") ||
233 dmi_match(DMI_BOARD_NAME, "PC Engines apu2")) {
234 apu_led->profile = apu2_led_profile;
235 apu_led->platform = APU2_LED_PLATFORM;
236 apu_led->num_led_instances = ARRAY_SIZE(apu2_led_profile);
237 apu_led->iosize = APU2_IOSIZE;
238 }
239
240 spin_lock_init(&apu_led->lock);
241 return apu_led_config(&pdev->dev, apu_led);
242}
243
244static struct platform_driver apu_led_driver = {
245 .driver = {
246 .name = KBUILD_MODNAME,
247 },
248};
249
250static int __init apu_led_init(void)
251{
252 struct platform_device *pdev;
253 int err;
254
255 if (!dmi_match(DMI_SYS_VENDOR, "PC Engines")) {
256 pr_err("No PC Engines board detected\n");
257 return -ENODEV;
258 }
259 if (!(dmi_match(DMI_PRODUCT_NAME, "APU") ||
260 dmi_match(DMI_PRODUCT_NAME, "APU2") ||
261 dmi_match(DMI_PRODUCT_NAME, "apu2") ||
262 dmi_match(DMI_PRODUCT_NAME, "PC Engines apu2"))) {
263 pr_err("Unknown PC Engines board: %s\n",
264 dmi_get_system_info(DMI_PRODUCT_NAME));
265 return -ENODEV;
266 }
267
268 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
269 if (IS_ERR(pdev)) {
270 pr_err("Device allocation failed\n");
271 return PTR_ERR(pdev);
272 }
273
274 err = platform_driver_probe(&apu_led_driver, apu_led_probe);
275 if (err) {
276 pr_err("Probe platform driver failed\n");
277 platform_device_unregister(pdev);
278 }
279
280 return err;
281}
282
283static void __exit apu_led_exit(void)
284{
285 int i;
286
287 for (i = 0; i < apu_led->num_led_instances; i++)
288 led_classdev_unregister(&apu_led->pled[i].cdev);
289
290 platform_device_unregister(apu_led->pdev);
291 platform_driver_unregister(&apu_led_driver);
292}
293
294module_init(apu_led_init);
295module_exit(apu_led_exit);
296
297MODULE_AUTHOR("Alan Mizrahi");
298MODULE_DESCRIPTION("PC Engines APU family LED driver");
299MODULE_LICENSE("GPL v2");
300MODULE_ALIAS("platform:leds_apu");
301
